无法让Rails 3 ActionMailer接受附件

Question

我正在将一个Rails 2.3.14应用程序迁移到Rails 3.0。在其中，邮件发送程序发送带有附件的消息。使用下面的代码，这在2.3.x中没有问题。

def notification(material, recipient, path_to_file)  
  enctype = "base64"

  @recipients  = recipient.email
  @from        = material.person.email
  @reply_to    = material.person.email
  @subject     = "New or updated materials: " + material.name
  @sent_on     = Time.now
  @content_type = "multipart/mixed"
  @headers['sender'] = material.person.email

  part    :content_type => "text/plain", 
          :body => render_message('notification', 
          :material => material, 
          :url =>  material.full_url_to_material)

  attachment  :content_type => "application" + "/" + material.file_type, 
              :body => File.read(path_to_file), 
              :filename => File.basename(material.file),
              :transfer_encoding => enctype, 
              :charset => "utf-8" if !!material.send_as_attachment

end

通过阅读Rails3.0 ActionMailer instructions，我将该方法修改为以下内容：

  def notification(material, recipient, path_to_file)
    @material = material
    @url = material.full_url_to_material
    attachments[material.file_file_name] = File.open(path_to_file, 'rb'){|f| f.read} if material.send_as_attachment?
    headers['sender'] = material.person.email
    mail(:to => recipient.email,
         :subject => "New or updated materials: " + material.name,
         :reply_to => material.person.email, 
         :from =>  material.person.email)
  end

MaterialMailer#notification在创建材质时调用。我有以下规范来测试它：

  it "will include the materials as an attachement with the the send_as_attachment field is set to 1" do
    it = Material.create(@materials_hash.merge(:send_notification => "1", :send_as_attachment => "1"))
    email =  ActionMailer::Base.deliveries[0] 
    email.body.should =~ Regexp.new("Name of the posted material: " + it.name )
    email.has_attachments?.should be_true
  end

正如我所提到的，这在2.3中工作得很好。现在，如果我将send_as_attachment标志设置为1，就会得到以下引用email.body.should行的错误：

  1) Material will include the materials as an attachement with the the send_as_attachment field is set to 1
     Failure/Error: email.body.should =~ Regexp.new("Name of the posted material: " + it.name )
       expected: /Name of the posted material: My material/
            got:  (using =~)
       Diff:
       @@ -1,2 +1 @@
       -/Name of the posted material: My material/

如果我更改规范并将send_as_attachment设置为0，则会出现以下错误，引用has_attachments？行：

1)物料将包括物料作为附件，并且send_as_attachment字段设置为1失败/错误: email.has_attachments?.should be_true expected为true

因此，包含附件以某种方式破坏了电子邮件。

我已经尝试了附加材料的其他方法：

  attachments[material.file_file_name] =  {:mime_type => "application" + "/" + material.file_content_type, 
              :content => File.read(material.file.path),  
              :charset => "utf-8"}

我已经尝试将文件路径硬编码到已知文件。但没那么走运。

还有没有其他地方我应该看看？

Answer 1

根据Christopher的建议，下面是我用来让它工作的邮件和规范代码：

  def notification(material, recipient, path_to_file)
    @material = material
    @url = material.full_url_to_material
    attachments[material.file_file_name] = File.open(material.file.path, 'rb'){|f| f.read} if material.send_as_attachment?
    headers['sender'] = material.person.email
    mail(:to => recipient.email,
         :subject => message_subject("New or updated materials: " + material.name),
         :reply_to => material.person.email, 
         :from =>  material.person.email)
  end

  it "will include the materials as an attachment with the the send_as_attachment field is set to 1" do
    it = Material.create(@materials_hash.merge(:send_notification => "1", :send_as_attachment => "1"))
    Delayed::Worker.new(:quiet => true).work_off
    email =  ActionMailer::Base.deliveries[0] 
    email.parts.each.select{ |email| email.body =~ Regexp.new("Name of the posted material: " + it.name )}.should_not be_empty
    email.has_attachments?.should be_true
  end

在规范中，我必须检查电子邮件的每个部分的正文，因为附件是第一部分还是第二部分并不一致。